INDEX OF INVENTIONS Letters Patent of the United States were Granted in the Week Ending January 14 1879 AND EACH BEARING THAT DATE. THE TELEPHONE. BY R. M FERGU HOW TO MAKE A PHONOGRAPH. FOR 1879. The Most Popular Scientific Paper In the World. VOLUME XL-NEW SERIES. 37 Park Row New York. English Patents Issued to Americans., scientific american, 1879-02-22
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